eprintid: 10075525 rev_number: 21 eprint_status: archive userid: 608 dir: disk0/10/07/55/25 datestamp: 2019-06-11 13:50:22 lastmod: 2021-01-12 22:53:38 status_changed: 2019-06-11 13:50:22 type: article metadata_visibility: show creators_name: Sun, Q creators_name: Zheng, J creators_name: Coop, MR creators_name: Altuhafi, FN title: Minimum image quality for reliable optical characterizations of soil particle shapes ispublished: pub divisions: UCL divisions: A01 divisions: B04 divisions: C05 divisions: F44 keywords: Optical shape characterization, Granular soils, Image quality note: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. abstract: Remarkable advances have been seen in image-based methods for automating soil particle shape characterizations in the last decade. However, the accuracy and reliability of image-based methods has rarely been questioned. This study shows that image quality affects the computational results of particle shape descriptors, including aspect ratio, sphericity, convexity, circularity, and roundness. These descriptors display a hierarchy of resistance to the effects of low image quality. The particle length, perimeter, and area are used as controlling parameters for quantifying the influence of image quality. The minimum requirements for ensuring reliable image-based shape characterization of these parameters are established. date: 2019-10 date_type: published publisher: Elsevier official_url: https://doi.org/10.1016/j.compgeo.2019.103110 oa_status: green full_text_type: other language: eng primo: open primo_central: open_green verified: verified_manual elements_id: 1662819 doi: 10.1016/j.compgeo.2019.103110 lyricists_name: Altuhafi, Fatin lyricists_name: Coop, Matthew Richard lyricists_id: FALTU89 lyricists_id: MRCOO77 actors_name: Coop, Matthew Richard actors_id: MRCOO77 actors_role: owner full_text_status: public publication: Computers and Geotechnics volume: 114 article_number: 103110 issn: 0266-352X citation: Sun, Q; Zheng, J; Coop, MR; Altuhafi, FN; (2019) Minimum image quality for reliable optical characterizations of soil particle shapes. Computers and Geotechnics , 114 , Article 103110. 10.1016/j.compgeo.2019.103110 <https://doi.org/10.1016/j.compgeo.2019.103110>. Green open access document_url: https://discovery.ucl.ac.uk/id/eprint/10075525/1/Image%20quality_4_29_2019.pdf